Method for performing synchronization with base station in wireless communication system, and apparatus therefor

Abstract

Disclosed is a method for performing, by a wireless device, synchronization with a base station in a wireless communication system. A method for synchronizing a wireless device according to one embodiment of the present invention comprises the steps of: receiving a primary synchronization signal and an auxiliary synchronization signal through a first subframe from a first base station; and performing synchronization with the first base station using the primary synchronization signal and the auxiliary synchronization signal, wherein the synchronization with the first base station is performed depending on whether a moving cell synchronization signal exists on the first subframe.

What is claimed is: 
     
         1 . A method of performing synchronization with a base station, which is performed by a wireless device in a wireless communication system, the method comprising:
 receiving a primary synchronization signal and a secondary synchronization signal through a first subframe from a first base station; and   performing synchronization with the first base station by using the primary synchronization signal and the secondary synchronization signal,   wherein the synchronization with the first base station is performed according to whether a moving cell synchronization signal is present in the first subframe.   
     
     
         2 . The method of  claim 1 , wherein the wireless device comprises a moving cell or a user equipment that does not support access to the moving cell. 
     
     
         3 . The method of  claim 1 , wherein when the moving cell synchronization signal is not present in the first subframe, the synchronization with the first base station is performed. 
     
     
         4 . The method of  claim 1 , wherein when the moving cell synchronization signal is present in the first subframe, the primary synchronization signal, the secondary synchronization signal, and the moving cell synchronization signal transmitted through the first subframe are discarded. 
     
     
         5 . The method of  claim 1 , wherein a transmission period of the moving cell synchronization signal is different from a transmission period of the primary synchronization signal and the secondary synchronization signal. 
     
     
         6 . The method of  claim 1 , wherein the moving cell synchronization signal is mapped to a slot of the first subframe, which is different from a slot where the primary synchronization signal and the secondary synchronization are mapped. 
     
     
         7 . The method of  claim 1 , wherein when the moving cell synchronization signal is present in the first subframe, a root index of a Zadoff-Chu sequence corresponding to the primary synchronization signal is 38. 
     
     
         8 . The method of  claim 1 , wherein performing the synchronization with the first base station comprises:
 when the moving cell synchronization signal is not present in the first subframe, determining whether the first subframe is an initial subframe through the secondary synchronization signal; and   when it is determined that the first subframe is not the initial subframe, performing the synchronization with the first base station.   
     
     
         9 . The method of  claim 8 , wherein performing the synchronization with the first base station further comprises:
 when it is determined that the first subframe is the initial subframe, determining whether the moving cell synchronization signal is present in a second subframe, which is received after a predetermined number of subframes from the reception of the first subframe; and   when the moving cell synchronization signal is not present in both of the first subframe and the second subframe, performing the synchronization with the first base station.   
     
     
         10 . The method of  claim 1 , further comprising:
 when the moving cell synchronization signal is present in the first subframe, performing synchronization with a second base station that does not transmit the moving cell synchronization signal.   
     
     
         11 . The method of  claim 1 , wherein a frequency band or a length of the moving cell synchronization signal is different from a frequency band or a length of the primary synchronization signal or the secondary synchronization signal. 
     
     
         12 . The method of  claim 1 , wherein when the moving cell synchronization signal is present in the first subframe, a subframe received from a serving base station connected to the wireless device is configured as an almost blank subframe (ABS). 
     
     
         13 . The method of  claim 1 , further comprising:
 determining whether the moving cell synchronization signal is present in the first subframe.   
     
     
         14 . A wireless device for performing synchronization with a base station in a wireless communication system, comprising:
 a receiver configured to receive a primary synchronization signal and a secondary synchronization signal through a first subframe from a first base station; and   a processor configured to perform synchronization with the first base station by using the primary synchronization signal and the secondary synchronization signal,   wherein the synchronization with the first base station is performed according to whether a moving cell synchronization signal is present in the first subframe.